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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8453b87d948b8280d757dbf047900c956135e4096d2c3a439b9e7640b853c8' 
  AND token = 'ENZlnRIWMlC5bS9vRUX5q5H99gBP1t+C0gSL2U8KDXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}